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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2063d421712b7fba36863113eff2cf90cb79ae1a16c4ff736c786f3602951c88' 
  AND token = '00tTf0lIBwcPxQMpllUh/KmqFpLSmZdu3AMCTTX88n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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