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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e321c486c832c25b07dea5771a66f6196c2ca8805fd70202ba94b3ae44ce44' 
  AND token = 'Qq28MXn7hM2t5O4Mor10PHT14p0a0mkYnroLQQ7FRzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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