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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce64d144eaca10ee7cce0dacf443dac08c0e8ae2ac81f1fa2c5ed274e104d84' 
  AND token = 'dz6aTqNlELqbbBAg1lox31qB6AoFg50WtcVDd3t60Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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