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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17a1b21960d50a63a5dc9a44b6f03c6b8dbadf70c74d4f2090a3f6c29a862b9' 
  AND token = 'wh8r533rUhbitf6A/shv7LmSsK7HGa9rkYr7rx3aFvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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