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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0a020b47d7ab00ac07c14b7744e526321c5d3d86c37aff1243ed994f619d59' 
  AND token = 'AhWmiE7XybCoXdgy48JzF4QgvwLVGaVhzrnocD8ncyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}