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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36066451af670bbb6679e0a8f8c444d0143ec468c53a8c25b9746ca22d32d6de' 
  AND token = 'Do/nhW3Ym2ZEDiXqQGqP0Mys1RS7rlp8FNG4zpOPk2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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