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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c110bdc19ec4d611ec0e200e440e67907dfe00cae3ebf3462e78c197292a554f' 
  AND token = 'wZMpzRapcjsf5D3XrfKPk8KXXtEniNPRTvZXJOJu+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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