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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06293c621e1528e10febcdacfd7d88de6d66d992cd2cbdc688f89cb347bd4775' 
  AND token = 'qT8lBVIQLti/kQQF4W1L9mF9HljX65QB2R5FyV3uwB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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