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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5e8726a4162be7304884d049f0f033d3400bc3689ef6f01bd9d283e45e7366' 
  AND token = 'F5iZ+JRc48epEgy5aYDTxSeeCRllOD+l8A1laAvcWrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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