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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c388f20e6e4089cca65c8a279e95acf7a50bf7549a070aa9cf7df08f588690' 
  AND token = 'LAX6+/wtx5YUXfq9xbShc5XaEte6U8pUvekVbo95aEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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