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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858c17f1f13315f0a8a3fe2338b0b983085d9cc2beded8e4e15d45a8f577ee17' 
  AND token = 'XpSnO9/kY96rwyoFM8jzfEbEa2nIVh/4KyQmRZ6FOmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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