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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ebeea0048d2842a8fc4dcda7f9878b26e2e2d77c0c5c8f72b37d0a0c6e22ca' 
  AND token = '32WPlgEMyNUh+gu+6pxV4kNWSKqUVYSn/CqXB3rCCfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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