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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd98edd88cfda66070737cd3188ce7d62dcf71e77462054349fa7d89c3906cc4' 
  AND token = '0KgvJVIzoulv5hvJgKo+WKDzK2k1xRtgByNXKR2JTcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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