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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfbdaca95d4cc59b841f02a73a301e41aa06217a587061ac999f7a107ca72d3' 
  AND token = 'kNJKvTma9m+qGUGkvP2TnMR0qKJdLFP2yFJpsuDXuRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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