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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ab36f89e6ca8bdfd9c4f05bcdc9a17ce8ca3f138e4522b9b10ff57fb28fa2a' 
  AND token = 'QkFdlNTX9togdj3FCS8/641dn2E5ge7gxn6TaQxWqeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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