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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b80b6ddee572e8c2b89026f6e9bc0860c1625688e932efdc2d031616a48871' 
  AND token = '6TZNoRWA4ZAtepCFthbdePwySV7cml9jzwAxKlMt8/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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