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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d247020f7597dc807eb6c9b466af3e44dedf6073c5a02d97f60c478afc23843' 
  AND token = 'YYbGv5ygaDrswXHN4XN/mHSvdwXwrdIfKv+h3rsAZRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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