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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21535dfa25ccd640b6da91133266dd3ad40597f0020dadf4915c42afcd9faa90' 
  AND token = 'X/vaXJ4CMU3HaFvsQ53muYO9UzzZDUHnmYMAAzfi8Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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