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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b29a343ca44e7a12566d57eeba054c0ca56e56859798580359148630131a2f' 
  AND token = 'pT3f/mu82LxnglJZSBcxBl6AiUxBnhVLhJftjflee/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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