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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa677ed0f676b1b6ab1c65d29ec9f4e76d491ed5ca7b46bc7eab6db1f5f5720' 
  AND token = 'iW9s14VEcWxwcRyn/kskdrtsGcTCd2IFJCR7YaOTG6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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