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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88f0c7c8983535ca0b6b1db0b7a9bcaea5a0b43e42e008fb03455439f6f0d39' 
  AND token = 'Y0NPsK6G878cZxZcw4T+rGo1sV9N5iTciJdpS1i0eww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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