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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c59c7624309cbc9aad9f9a030691223eb9d7c88556b2fcf35360cef481ede6a' 
  AND token = 'BR1OcVOQvd3mZEsG9Gwl/snTnLt5zJRlHbSSd2Q9c5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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