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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c3ba6e36e1caa4f5d31e5b4904a503db54ae41b038814f7c8c114ea2f64bb8' 
  AND token = '7NG3fOhjqXcvrnYFhttZXFzHPcwwPZ5qmssWYV1oqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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