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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f08efe97c4b9bd06fcab2737ec08e977e895ed79a7c4f28d8ba748585f8fed8' 
  AND token = 'FgAkpE08y/YzF8rLdNm8wY3H9fhUaq6h41tohcTHUfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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