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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687b7f75a1f43434a8a596d43ee99d92f7e73d8330d7b3b560adb1d9d9112887' 
  AND token = 'q0fCNLyQpyxOEE9qcWCYESpENKcN9NvbxEa/g7kZ1ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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