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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23938f40efc7592eea401ebe7690e7d59f81159b6298bbb152b65d8e0972711d' 
  AND token = 'clqtYjQv2LuNdpu1muA/uRcYoTmgfImJsELKfcxW0ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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