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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b69780502b9edc03d508313a9fa6cc7c5b223c24ec6f17249a5205ff6f3d9f2' 
  AND token = 'cd7BZtxuWp3SlM790EIkm1gtv7lRxfmUgqiX5u6Djt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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