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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e060cde21e500284ae59de1daa47495f7438282873178d52173ed1092f60fd' 
  AND token = 'QOSgIo+aFuyc2ubpFjHsIOgQcO8byuHxgLknwiZSOQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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