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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823dbb1207ed30871a0ae205e42938d7d0951210a885364e5b2f37590cbba909' 
  AND token = 'zlztzZ7DtO7c/koB0431zjQzp0IkviRzxr1HacqEKwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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