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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25a37b64a554edd32959365f2805bcf3dc201175d8dee076fa1c4fe5cdc30d1' 
  AND token = 'TN5NcutOvr6W3F0yOYPx6tZLOdqYC0Ork5Fr9erHuJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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