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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df033e6305d1cc3250fbace15ee788e01a227df8cb00efc178b199b17da2fc9d' 
  AND token = 'Wvkv7WiiPEAB9BdQ1dY9H6plX06n+wx7eWw5aq7Rwtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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