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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd29cf796192554bff2740b92749b65d2ef445d6be7e63a55d56cdd4d4041f74' 
  AND token = 'i+L96sa5KFrN+FGsvh+F5fPcfcOCp+6u3LfPJIK5gUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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