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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae42f93071830277bd885ec9b6efe1dae42944c98fea07da6d03982d5bdea7a' 
  AND token = 'XdlifMzJOlu1qfyWUPGGa2RfZyA4G9ZYx5cce+OfvjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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