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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a2e65add99ab6cf09e357fea70908bf4d38cc7c67e5f9f9d99b8ea2a79230b' 
  AND token = 'qI3j4VAacz2Kw8aRtbPAXMOd4JOg9KnjlRABy5ORzQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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