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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60704cdb74b432ba508f6392bea9a9ee8c16c9b29a740ddb9f3673a4109e925f' 
  AND token = 'eteHr8DNl+yP4kMu8XntQdtFsPSfxDa3AK7HBsPlaD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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