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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d9eb59b2876a9ce661ec8aef54df354c1a043a2fa664194f58b579b8f7599b' 
  AND token = 'NrOZi/CvNHkdzwCAWSvTrpZ8bu41PmYRxl3GxFaEs6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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