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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce20bb36d992d4659feebb1ec292153650fec59e22e09f9d5d43edab797b9d0d' 
  AND token = 'Shgn5mVk2ES14Z1AAEUvwDQGsfaDl1ki5NOoRrU5fvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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