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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c9edb26155d74863968cd3fedfb59e45df044e5906a67f9d66426b6f9693f9' 
  AND token = 'JDbiIVBW7U6O6xsG9d/kmfuQagriKDJk3cbxHwlwef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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