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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4e2d974a50792e01f844f48277a36bb3b800f83e5ab2defe6dd9f77bf20f49' 
  AND token = '9G0Ql7yAB0r1kuK2f+F0FVikOKCRz26Qq4qCBjez6QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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