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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60136cff91b0b7e16d8b89e45b626cd30b07ca8bcc84e852729c3cb7347adbc7' 
  AND token = 'TkoiYdBLGGDlF9kbQo+cjrxyMr6nUQIpj6WlfyOOChk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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