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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28234eb4e90febc31f5e7b49f261fa2e362fd61b4fa94230488bb7d1c229cf4' 
  AND token = '3ld2YgnqEwglOrYg+Z8wtESBmZdTwIQQUvSvqpf0CJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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