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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be3016d2e2d1c778585f14136fb22a4828d8bf69dd87326b4fa005b693b80de' 
  AND token = 'b9CG+nX3XUDo0v2Hb5S2tCeyP+pQnZJdLSVxWbZZPFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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