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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f8c9d43f9df3cb377085bed04a2cafa4c9363795a9ce2bf7b4ed19a5ef5aaa' 
  AND token = 'l7igsNDd5nxF9W63EsP1K8VLf/vDKWRfc/LNVwA2xHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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