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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f9c24ca328044c15c5b04a7dc4a8b4e26ff0e6de02160d0b78d3fb2e6beecf' 
  AND token = 'BYj/LQ+oIIAalvqD9jypHiULobT9mggfh8HiAsbW0fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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