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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53016c55edbd48508e0c8e3d1297aefc74227ed1d9322e5af7a57e8e2d5bcc2f' 
  AND token = 'Hm+FgAY9TX0xjL9/RcoSZB48toUslUp1pxET3fkjCl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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