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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04db55b017b554a73d7cfe6a6fa52a3e51a65be6b0ff843286e92cb876ba168' 
  AND token = '1yTzPhLrypONVVlkExsMM1/DwQy4v16iWjX5XtGuRso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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