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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d62e9adbad4356c533653e591d88dc76afbb9698d95a4cde2334455009859b' 
  AND token = '1h3QBPB9WPd8TEWIQITpBGUgR37BMaIvPm/t5Y53i80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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