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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad97dba074797bb9e29e432d7448de00a86f08bb25fe53a207d211ba4a1e6eb0' 
  AND token = 'WibQGqkwq6iouCrRcgo+7PX4zoNWk7b0NsU0QD+7Nz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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