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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a26a18fc125e5bb6eb1d5961d3ea78cbeeca9bd3e52180394a25644c78ac3e' 
  AND token = 'hk1pJ1fGJ4l/+iczarZtEl7FgoIxih+Rs8VAyf1T/9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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