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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6939dc8c0a2d080d22deea63dc80efc531a03b8a531bed85c70ed3f8a9c06c' 
  AND token = 'bivgvkDU+yiJS6++E2LJx8caIPBdbeiFW9DQ2xm8oGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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