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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde19e588e7df8baa297e2f9d7699272413b2c44d27f2eae7ba607705199cbe7' 
  AND token = 'LaM/dnZfxoygez8TcgXzsvCluWN8JHNR/Yf6N6o54C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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