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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf9df12f3c22480b17f77687752d5d0f57f8b5e6d78dabb9431b8d6c9ed5db4' 
  AND token = 'OSMysIysFOpkZ30BcFZy4Vp+4BrTEoe8gewGzg63snI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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