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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc577b3f4a7c09a08e5bb8498d20e236fa2f9abaf932b12cbacbcaad391d9df' 
  AND token = 'A41J7vO8wCGuyt7RmZwOzIPN3UfXfAM7jygXMgDcfU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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