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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a2d4ca1627f2189333cda8cd0f252aaeb00fece8e216488481982ed23a1106' 
  AND token = 'Kvu8jtgA3K3o+cV2mz9EFQEBcQsDU/TweArTzICqFY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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