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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17f2f1c7baaf2c8be1a133a8feccb2a16206e1793f28e238f1bc89822094d36' 
  AND token = 'P1CuyhYt/kR097bQV911CCnGbVd/ZA44le+B0luAuwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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