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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98202f58d22e8a9df6d31a95cb650f38e12093900548b820ca1eab3b74a01a9' 
  AND token = 'stiA8tXwMMX0NCjoDP4Vzj943qi4r5S78sP+S1kcHfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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