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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105dd59c40295b807a2f0c51c7bf4d08ea930a8c157ea50c35c4bd02782e116a' 
  AND token = 'GNlGmznML2Z6RlBM5ScE8tgObp7DxAX2lfKohL/jyU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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