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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5feda31ac014bd03bb2b50e1468b3f3158813c49b721b27fe3c9efa64cf61f' 
  AND token = '8pcHfH1NIf+1CyX/1tnczQCAJTItrfzocdPv0Ue+b24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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