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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4e082e332e5c1f72e93d052a7cf3f081fc0a8ca8d51e1a092a232b73d74e8c' 
  AND token = '9XHlP4oyC4lq+Bl7Ae79IfLwKqaHQQM3cuGs9fQuhVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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