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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff69abfdb2f03a5ca6ced3c44eda31d32a1591ac4cb65a01b09c5cbe9d12e61' 
  AND token = 'NhrP5rApM8psXoAYUR8hsC2HREQCejcZUJ5TZLQtmDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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