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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc7af8dc1246586758af1b62f8ada7e40643832bcc4cb45dc56d7f20dc9ac34' 
  AND token = 'QyFOpyoIOyntemkgtH1/5/WOhBjNBn0lRePQ9a3h4Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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