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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b798c71b445738af126ef77ae8aef6f0f61ea220297601382064d1994af107c2' 
  AND token = 'dbj4DbQrcrpt3U+ja0yMDfHpY/7oIezy+pW+sZswgr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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