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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e0cef6667ac5083e7b325acd9f8e95f36fd292c5e26aa46f051c1d8922eb16' 
  AND token = 'pPhUYfGHKK9fOazqMazwbA/zdxEAqhnQPPFGyc4FQXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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