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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd03712394aa87f4dca408e5a30fbe0e6999ea21abf890a14c96f5c85ba8b07' 
  AND token = 'skkg9J/0G4FxwYNB/P8eG82o0+eKhJ1ejAXAhPcJIqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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