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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3efd83994ee7f149f0d84bc10ff96647419b588eec21cc7b192b71b7a6d97f8' 
  AND token = '8sYfmXh0SEMLtIAeN7kk935sdDyNTqEUczZCxK3o78U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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