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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6942bc35169f1e993fc9d43e35753c394050b326ecda4920a8c8e89a46a6a564' 
  AND token = 'oGlcJ0wmTV/eOrrCaQma2zXGhzgVVF+fTWUX76r6HxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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